Accuracy Analysis of Group Delay Variation Measurement in Anechoic Chambers

Precise GNSS antenna characterization is needed in several applications, targeting high-accuracy positioning and timing. While the characterization of phase center variations is nowadays canonically established, the measurement of group delay variations is still a matter of research for its high requirements in terms of measurement accuracy. The present paper shows an analysis of the accuracy performance achievable in anechoic chambers, estimating the uncertainty in the group delay variation produced by imperfections of the measurement system itself and assessing the impact of signal processing countermeasures.